Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9609fcd40541512…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 17:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6eaffe3ca7133aecc4e35810cdd47045 SHA-1: 49f40615e093ea7ce0c8cbe750097003749203c9 SHA-256: f9609fcd40541512e4fc64e0252a13789000ad6f4d734cb892c4c7f8e6887a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=cbse+board+time+table+2020+class+10+pdf+download PDF link annotation
    • http://ingegnasrl.com/userfiles/files/22329136196.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/juwuwap.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9897c2fcb5---sasidajogo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tigivigevaxu.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/sonulusepugitiporuxafaxot.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/gogonimu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d84d6b13da0---18211698642.pdfIn PDF document text
    • http://novichiha.ru/pic/file/24105023360.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/guwolodebav.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/69941652424.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/593fb0b53c403bd1c08a4802d6da841c/bunutozul.pdfIn PDF document text
    • http://milsagliksen.org/upload/ckfinder/files/62849485107.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9a0b792e---lafaxijanagidonipoveraru.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/88522058929.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bed81677---2448448739.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/7684922741.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/ee9de0e38b9d592f944cebd496559e22/nesenekuvapuxisirox.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160cfadb8b3ed7---tosalokezamoviveseja.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c8f2a9f8f003ff1d8eadb593eaadcfb1/17510377188.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160803a925ed65---73715259187.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/58782031411.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/rizirarivubixet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119def68c35f---nisorovakugabo.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/31051501137.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/m5c536ikorhlcnu0hgk51he1v1/bixedirekewe.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mb2gi4jrttm2jvm3fhni5ie4r7/97948066262.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CD 15760 bytes
SHA-256: 15e9ec308c550077e3cd4430f0cb477d8ca9e1041f26a66248f1b911a289049c
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 11332 bytes
SHA-256: 70242d8f086965a4cc428d64541312ea84d64b2cbf3599f1aac58b2dd3e78fa7

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